Comission structure help with Accountant Finance Math

Hi There one of our client looking for help with their commission/sales reporting we are looking for a commission report idea for our system to use in SALES REPORT section . Our business arrange contracts and this could be from 1year to 5year points we would like to show is Expected Paid Claw-Back NET VAT TOTAL User should be able to see how much he is going to earn for each contract and how he is paid monthly for it and if there is claw-back anytime Contracts could start any month any day . Contract can be 1year up to 5year. We are looking for the best way of displaying for more than one contract same time